28310309 has 8 divisors (see below), whose sum is σ = 30170880. Its totient is φ = 26502256.

The previous prime is 28310299. The next prime is 28310333. The reversal of 28310309 is 90301382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28310309 - 2²⁰ = 27261733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28310369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12014 + ... + 14175.

It is an arithmetic number, because the mean of its divisors is an integer number (3771360).

Almost surely, 2^28310309 is an apocalyptic number.

It is an amenable number.

28310309 is a deficient number, since it is larger than the sum of its proper divisors (1860571).

28310309 is a wasteful number, since it uses less digits than its factorization.

28310309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26259.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 28310309 is about 5320.7432751449. The cubic root of 28310309 is about 304.7765415097.

The spelling of 28310309 in words is "twenty-eight million, three hundred ten thousand, three hundred nine".